experience browser/mobile

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Is your feature request related to a problem? Please describe.
Hi there.

Searched the past issues ... cannot find anything similar ... so here it is ...

**** invitation to a talk as a nc-non-registered user via browser on smartphone****

1. as in my previous issue described ... you have to turn your phone into landscape-mode because the layout in the portrait-mode is screwed ...if you close the details-tab it is fine ... but before that everything looks not good
2. there is no sound/ringing when the other side starts the conversation ... only a visual clue that the conversation has started ...there is only sound/ringing if you start the call/conversation
3. if you are in landscape-orientation and fullscreen you always see the big red button (in german "Anruf verlassen" ... so maybe "leave/end call" in english) ... this is dominating the whole screen

Describe the solution you'd like

1. optimize css for portrait-orientation and/or deactivate details-tab on default when first entering
2. in addition to the visual clue a ringing/sound when the other side starts the call/conversation
3. all buttons fade out after a few seconds and come back when you touch the screen

Cheers ...
qki

Reproduce an invitation to a Talk conversation as an unregistered user in a smartphone browser, checking portrait layout, incoming-call sound, and fullscreen controls. No files or tests are named in the issue, so first locate the mobile call UI and its audio behavior. Done means portrait mode is usable, incoming calls provide sound as well as a visual cue, and controls fade and reappear on touch.